Equalization in CDMA downlink based on channel estimation

RAKE receiver deteriorates as MAI (multiaccess interference) becomes serious in CDMA downlink channel. Orthogonality of spreading sequences can be restored through equalization on chip levels. In this paper, ZF (zero forcing) and MMSE (minimum mean square error) equalization on chip levels are studied and simulated. Moreover, an adaptive algorithm and simplified equalizer architecture are proposed to lower computation complexity.